Observation of two-gap superconductivity in SrFe1.85Co 0.15As2 single crystals by scanning tunneling microscopy and spectroscopy

Jewook Park; Seunghyun Khim; Gun Sang Jeon; Jun Sung Kim; Kee Hoon Kim; K. Char

doi:10.1088/1367-2630/13/3/033005

Observation of two-gap superconductivity in SrFe_1.85Co _0.15As₂ single crystals by scanning tunneling microscopy and spectroscopy

Jewook Park, Seunghyun Khim, Gun Sang Jeon, Jun Sung Kim, Kee Hoon Kim, K. Char

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Abstract

Superconducting properties of SrFe_1.85Co_0.15As ₂ single crystals and their parent material, SrFe₂As ₂, were investigated by scanning tunneling microscopy and spectroscopy (STM/S). In the parent material, we modeled surface conditions on the in situ cleaved single crystals, based on the observation of 2×1 stripe patterns and √ 2× √ 2 square-lattice patterns in the atomic-resolution topography images and with the help of local density of states measurements. In the STM/S studies on SrFe_1.85Co _0.15As₂, a robust superconducting gap (2δ _large = 17.3 meV) was observed in the conductance spectra measured along a line on the SrFe1.85Co0.15As2 surface. Moreover, an additional small gap-like (2δ_small = 2.9 meV) structure was simultaneously observed. Our observation corroborates the two-gap structures in iron-based superconductors.

Original language	English
Article number	033005
Journal	New Journal of Physics
Volume	13
DOIs	https://doi.org/10.1088/1367-2630/13/3/033005
State	Published - Mar 2011
Externally published	Yes

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title = "Observation of two-gap superconductivity in SrFe1.85Co 0.15As2 single crystals by scanning tunneling microscopy and spectroscopy",

abstract = "Superconducting properties of SrFe1.85Co0.15As 2 single crystals and their parent material, SrFe2As 2, were investigated by scanning tunneling microscopy and spectroscopy (STM/S). In the parent material, we modeled surface conditions on the in situ cleaved single crystals, based on the observation of 2×1 stripe patterns and √ 2× √ 2 square-lattice patterns in the atomic-resolution topography images and with the help of local density of states measurements. In the STM/S studies on SrFe1.85Co 0.15As2, a robust superconducting gap (2δ large = 17.3 meV) was observed in the conductance spectra measured along a line on the SrFe1.85Co0.15As2 surface. Moreover, an additional small gap-like (2δsmall = 2.9 meV) structure was simultaneously observed. Our observation corroborates the two-gap structures in iron-based superconductors.",

author = "Jewook Park and Seunghyun Khim and {Sang Jeon}, Gun and {Sung Kim}, Jun and {Hoon Kim}, Kee and K. Char",

year = "2011",

month = mar,

doi = "10.1088/1367-2630/13/3/033005",

language = "English",

volume = "13",

journal = "New Journal of Physics",

issn = "1367-2630",

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T1 - Observation of two-gap superconductivity in SrFe1.85Co 0.15As2 single crystals by scanning tunneling microscopy and spectroscopy

AU - Park, Jewook

AU - Khim, Seunghyun

AU - Sang Jeon, Gun

AU - Sung Kim, Jun

AU - Hoon Kim, Kee

AU - Char, K.

PY - 2011/3

Y1 - 2011/3

N2 - Superconducting properties of SrFe1.85Co0.15As 2 single crystals and their parent material, SrFe2As 2, were investigated by scanning tunneling microscopy and spectroscopy (STM/S). In the parent material, we modeled surface conditions on the in situ cleaved single crystals, based on the observation of 2×1 stripe patterns and √ 2× √ 2 square-lattice patterns in the atomic-resolution topography images and with the help of local density of states measurements. In the STM/S studies on SrFe1.85Co 0.15As2, a robust superconducting gap (2δ large = 17.3 meV) was observed in the conductance spectra measured along a line on the SrFe1.85Co0.15As2 surface. Moreover, an additional small gap-like (2δsmall = 2.9 meV) structure was simultaneously observed. Our observation corroborates the two-gap structures in iron-based superconductors.

AB - Superconducting properties of SrFe1.85Co0.15As 2 single crystals and their parent material, SrFe2As 2, were investigated by scanning tunneling microscopy and spectroscopy (STM/S). In the parent material, we modeled surface conditions on the in situ cleaved single crystals, based on the observation of 2×1 stripe patterns and √ 2× √ 2 square-lattice patterns in the atomic-resolution topography images and with the help of local density of states measurements. In the STM/S studies on SrFe1.85Co 0.15As2, a robust superconducting gap (2δ large = 17.3 meV) was observed in the conductance spectra measured along a line on the SrFe1.85Co0.15As2 surface. Moreover, an additional small gap-like (2δsmall = 2.9 meV) structure was simultaneously observed. Our observation corroborates the two-gap structures in iron-based superconductors.

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U2 - 10.1088/1367-2630/13/3/033005

DO - 10.1088/1367-2630/13/3/033005

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VL - 13

JO - New Journal of Physics

JF - New Journal of Physics

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ER -

Observation of two-gap superconductivity in SrFe_1.85Co _0.15As₂ single crystals by scanning tunneling microscopy and spectroscopy

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